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DTC U129D-00

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DTC U129D-00  : Lost Communication With The Precision All Wheel Steer Control Unit

NOTE: Before you troubleshoot, review the general troubleshooting information .

DTC Description DTC Freeze Frame
U129D-00 Lost Communication With The Precision All Wheel Steer Control Unit    

DTC (IDAS)

  1. CAN gateway system DTC check

    -1. Turn the vehicle to the ON mode.

    -2. Check for CAN gateway system DTCs with the HDS.

    DTC Description DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off  
    U0047-00 CAN Gateway F-CAN ch B Bus Off  
    U0056-00 CAN Gateway F-CAN ch C Bus Off  
    U3000-49 CAN Gateway Internal Failure  

    Is DTC U0029-00, U0047-00, U0056-00, and/or U3000-49 indicated?

    YES 

    Go to the indicated DTCs troubleshooting .

    NO 

    Go to step 2.

  2. F-CAN circuit communication check

    -1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

    F-CAN Bus Connected Unit Check

    Which result is indicated?

    Precision all wheel steer control unit (Bus C) is Not Available

    Go to step 3.

    Multipurpose camera unit (Bus B) is Not Available

    Go to step 4.

    Multipurpose camera unit (Bus C) is Not Available

    Go to step 5.

    Multipurpose camera unit and electronic parking brake control unit are Detected

    Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting . If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

  3. Open wire check (F-CAN C_L, F-CAN C_H lines)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Disconnect the following connectors.

    CAN gateway 24P connector
    Precision all wheel steer control unit connector A (16P)

    -3. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 24P connector: disconnected
      Precision all wheel steer control unit connector A (16P): disconnected
    Test point 1 CAN gateway 24P connector No. 9
    Test point 2 Precision all wheel steer control unit connector A (16P) No. 6
    Test point 1 CAN gateway 24P connector No. 8
    Test point 2 Precision all wheel steer control unit connector A (16P) No. 14
    GHH349308Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Check for loose terminals in the CAN gateway 24P connector and the precision all wheel steer control unit connector A (16P) connector. If they are OK, update the precision all wheel steer control unit if it does not have the latest software , or substitute a known-good precision all wheel steer control unit , then recheck. If DTC U129D-00 is not indicated after substitution, replace the precision all wheel steer control unit .

    NO 

    Repair an open in the wire between the CAN gateway and the precision all wheel steer control unit.

  4. Open wire check (F-CAN B_L, F-CAN B_H lines)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Disconnect the following connectors.

    CAN gateway 24P connector
    Multipurpose camera unit 20P connector

    -3. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 24P connector: disconnected
      Multipurpose camera unit 20P connector: disconnected
    Test point 1 CAN gateway 24P connector No. 11
    Test point 2 Multipurpose camera unit 20P connector No. 2
    Test point 1 CAN gateway 24P connector No. 10
    Test point 2 Multipurpose camera unit 20P connector No. 13
    GHH349309Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN B_L and F-CAN B_H wires are OK. Go to step 6.

    NO 

    Repair an open in the wire between the CAN gateway and the multipurpose camera unit.

  5. Open wire check (F-CAN C_L, F-CAN C_H lines)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Disconnect the following connectors.

    CAN gateway 24P connector
    Multipurpose camera unit 20P connector

    -3. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 24P connector: disconnected
      Multipurpose camera unit 20P connector: disconnected
    Test point 1 CAN gateway 24P connector No. 9
    Test point 2 Multipurpose camera unit 20P connector No. 4
    Test point 1 CAN gateway 24P connector No. 8
    Test point 2 Multipurpose camera unit 20P connector No. 15
    GHH349310Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN C_L and F-CAN C_H wires are OK. Go to step 6.

    NO 

    Repair an open in the wire between the CAN gateway and the multipurpose camera unit.

  6. Multipurpose camera unit check (update)

    -1. Update the multipurpose camera unit if it does not have the latest software .

    -2. Turn the vehicle to the OFF (LOCK) mode.

    -3. Turn the vehicle to the ON mode, then wait for at least 5 seconds.

    -4. Check for DTCs with the HDS.

    DTC Description DTC Freeze Frame
    U129D-00 Lost Communication With The Precision All Wheel Steer Control Unit    

    Is DTC U129D-00 indicated?

    YES 

    Check for loose terminals in the multipurpose camera unit 20P connector. If the multipurpose camera unit was updated and the symptom/indication is still present, replace the multipurpose camera unit .

    NO 

    Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTC's troubleshooting.

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